Problem colouring particles

Hello, I'm newbie so I'll probably make one of the most stupid question. Sorry in advance. I'm reading the Unity manual, and in the Particle Animator section there's an explanation about how to colour the particles along its lifetime.

Now my question. I have a cube without Particle Render component, but with a Particle Renderer, Ellipsoid particle emitter, and Particle Animator attached to it. The Min and Max energy are different (1-100), I've already marked the "Does animate colour?" checkbox and chose differents colours but my particles doesn't change its colour Scene View, neather in Game View when I hit the play button.

What I'm doing wrong??

Thanks.

Fixed. I didn't have a material asigned to the particles. Now all works well.